/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { min-height: 100vh; line-height: 1.6; -webkit-font-smoothing: antialiased; }
img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
:focus-visible { outline: 3px solid var(--color-gold); outline-offset: 2px; }

/* ===== CSS VARIABLES ===== */
:root {
  --color-primary: #a83232;
  --color-primary-light: #c94a4a;
  --color-primary-dark: #7a2525;
  --color-gold: #c9a84c;
  --color-gold-light: #e0c878;
  --color-gold-dark: #a8882e;
  --color-brown: #5a3e2b;
  --color-brown-light: #7a5a3e;
  --color-cream: #f5f0eb;
  --color-cream-dark: #e8ddd0;
  --color-surface: #e8dcd0;
  --color-dark: #2e2a24;
  --color-dark-light: #4a443c;
  --color-accent: #8b6f47;
  --color-shadow: rgba(26, 26, 26, 0.25);
  --color-white: #ffffff;
  --color-black: #1a1a1a;

  --font-heading: "Noto Serif SC", "宋体", "SimSun", "华文宋体", "STSong", serif;
  --font-body: "Noto Sans SC", "微软雅黑", "Microsoft YaHei", "PingFang SC", "Helvetica Neue", sans-serif;
  --font-mono: "JetBrains Mono", "Courier New", "Consolas", monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  --container-max: 1200px;
  --header-top-height: 64px;
  --nav-height: 48px;
  --header-total: calc(var(--header-top-height) + var(--nav-height));

  --transition-fast: 200ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  --shadow-sm: 0 2px 8px var(--color-shadow);
  --shadow-md: 0 4px 16px var(--color-shadow);
  --shadow-lg: 0 8px 32px var(--color-shadow);
}

/* ===== TYPOGRAPHY ===== */
body { font-family: var(--font-body); font-size: 16px; font-weight: 400; color: var(--color-dark); background: var(--color-cream); }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: 700; line-height: 1.2; color: var(--color-primary-dark); }
h1 { font-size: 36px; margin-bottom: var(--spacing-lg); }
h2 { font-size: 30px; margin-bottom: var(--spacing-md); }
h3 { font-size: 24px; margin-bottom: var(--spacing-md); }
h4 { font-size: 20px; margin-bottom: var(--spacing-sm); }
p { margin-bottom: var(--spacing-md); }
small, .text-small { font-size: 13px; font-weight: 300; line-height: 1.4; }
code, .text-mono { font-family: var(--font-mono); font-size: 14px; font-weight: 400; }
.text-center { text-align: center; }
.text-gold { color: var(--color-gold); }

/* ===== CONTAINER & LAYOUT ===== */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--spacing-lg); }
.content-section { padding: var(--spacing-3xl) 0; }
.content-section--cream { background: var(--color-cream); }
.content-section--surface { background: var(--color-surface); }
.content-section--dark { background: var(--color-dark); color: var(--color-cream); }
.content-section--dark h1, .content-section--dark h2, .content-section--dark h3 { color: var(--color-gold-light); }
.content-section--dark a { color: var(--color-gold); }
.content-section--dark a:hover { color: var(--color-gold-light); }

/* ===== SKIP LINK ===== */
.skip-link { position: absolute; top: -100%; left: var(--spacing-md); background: var(--color-primary); color: var(--color-white); padding: var(--spacing-sm) var(--spacing-md); border-radius: var(--radius-sm); z-index: 10000; font-weight: 600; transition: top var(--transition-fast); }
.skip-link:focus { top: var(--spacing-sm); }

/* ===== HEADER ===== */
.header { position: relative; background: var(--color-primary); color: var(--color-white); box-shadow: var(--shadow-sm); }
.header__inner { max-width: var(--container-max); margin: 0 auto; }
.header__top { display: flex; align-items: center; justify-content: space-between; height: var(--header-top-height); padding: 0 var(--spacing-lg); }
.header__brand { display: flex; align-items: center; gap: var(--spacing-md); }
.header__brand-icon { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; background: var(--color-gold); color: var(--color-primary); border-radius: var(--radius-md); font-family: var(--font-heading); font-size: 22px; font-weight: 700; line-height: 1; flex-shrink: 0; }
.header__brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.header__brand-name { font-family: var(--font-heading); font-size: 22px; font-weight: 700; letter-spacing: 2px; }
.header__brand-desc { font-size: 12px; opacity: 0.8; font-weight: 300; letter-spacing: 4px; }
.header__actions { display: flex; align-items: center; gap: var(--spacing-md); }
.header__toggle { display: none; flex-direction: column; gap: 5px; padding: var(--spacing-sm); cursor: pointer; }
.header__toggle-bar { display: block; width: 26px; height: 2px; background: var(--color-white); border-radius: 2px; transition: transform var(--transition-base), opacity var(--transition-base); }
.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(2) { opacity: 0; }
.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.header__nav { background: var(--color-primary-dark); }
.header__nav-list { display: flex; align-items: center; gap: 0; max-width: var(--container-max); margin: 0 auto; padding: 0 var(--spacing-lg); }
.header__nav-item { position: relative; }
.header__nav-link { display: block; padding: 12px 20px; font-size: 15px; font-weight: 400; color: var(--color-cream); transition: background var(--transition-fast), color var(--transition-fast); white-space: nowrap; }
.header__nav-link:hover { background: rgba(255,255,255,0.12); color: var(--color-gold-light); }
.header__nav-link[aria-current="page"] { color: var(--color-gold); font-weight: 600; position: relative; }
.header__nav-link[aria-current="page"]::after { content: ''; position: absolute; bottom: 0; left: 20px; right: 20px; height: 3px; background: var(--color-gold); border-radius: 2px 2px 0 0; }

/* ===== BUTTONS ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--spacing-sm); padding: 10px 24px; font-family: var(--font-body); font-size: 15px; font-weight: 600; border-radius: var(--radius-full); transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast); cursor: pointer; text-align: center; line-height: 1.4; white-space: nowrap; }
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.btn:active { transform: translateY(0); }
.btn--gold { background: var(--color-gold); color: var(--color-primary-dark); border: 1px solid var(--color-gold); }
.btn--gold:hover { background: var(--color-gold-light); border-color: var(--color-gold-light); color: var(--color-primary-dark); }
.btn--outline { background: transparent; color: var(--color-gold); border: 1.5px solid var(--color-gold); }
.btn--outline:hover { background: var(--color-gold); color: var(--color-primary-dark); }
.btn--sm { padding: 6px 16px; font-size: 13px; }
.btn--lg { padding: 14px 36px; font-size: 17px; }

/* ===== BREADCRUMB ===== */
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: var(--spacing-xs); padding: var(--spacing-md) 0; font-size: 13px; color: var(--color-dark-light); }
.breadcrumb__item { display: flex; align-items: center; gap: var(--spacing-xs); }
.breadcrumb__item + .breadcrumb__item::before { content: '/'; color: var(--color-accent); margin-right: var(--spacing-xs); }
.breadcrumb__link { color: var(--color-accent); transition: color var(--transition-fast); }
.breadcrumb__link:hover { color: var(--color-primary); }
.breadcrumb__current { color: var(--color-dark); font-weight: 600; }

/* ===== IMAGE CONTAINERS ===== */
.img-container { position: relative; overflow: hidden; border-radius: var(--radius-md); background: var(--color-surface); }
.img-container img { width: 100%; height: 100%; object-fit: cover; }
.img-container--hero { width: 100%; height: 60vh; min-height: 360px; border-radius: var(--radius-lg); }
.img-container--card { width: 100%; aspect-ratio: 16 / 10; border-radius: var(--radius-md); }
.img-container--icon { width: 64px; height: 64px; border-radius: var(--radius-sm); }
.img-container--round { border-radius: var(--radius-full); }
.img-container--decorative { opacity: 0.85; }

/* ===== FOOTER ===== */
.footer { background: var(--color-dark); color: var(--color-cream); padding: var(--spacing-3xl) 0 var(--spacing-xl); }
.footer__inner { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--spacing-lg); text-align: center; }
.footer__slogan { font-family: var(--font-heading); font-size: 26px; font-weight: 700; color: var(--color-gold); letter-spacing: 6px; margin-bottom: var(--spacing-xl); position: relative; display: inline-block; }
.footer__slogan::before, .footer__slogan::after { content: '◆'; font-size: 14px; color: var(--color-gold); opacity: 0.5; margin: 0 var(--spacing-md); vertical-align: middle; }
.footer__nav { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--spacing-xs) var(--spacing-lg); margin-bottom: var(--spacing-xl); }
.footer__nav-link { font-size: 14px; color: var(--color-cream); opacity: 0.75; transition: opacity var(--transition-fast), color var(--transition-fast); padding: var(--spacing-xs) 0; }
.footer__nav-link:hover { opacity: 1; color: var(--color-gold); }
.footer__info { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--spacing-md) var(--spacing-xl); font-size: 13px; opacity: 0.7; margin-bottom: var(--spacing-lg); line-height: 1.8; }
.footer__info-item { display: inline-block; }
.footer__link { color: var(--color-gold); transition: color var(--transition-fast); }
.footer__link:hover { color: var(--color-gold-light); text-decoration: underline; }
.footer__icp { font-size: 12px; opacity: 0.5; margin-bottom: var(--spacing-md); letter-spacing: 1px; }
.footer__copyright { font-size: 13px; opacity: 0.6; border-top: 1px solid rgba(255,255,255,0.08); padding-top: var(--spacing-md); }

/* ===== UTILITY ===== */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.divider { height: 1px; background: var(--color-surface); margin: var(--spacing-xl) 0; }
.divider--gold { background: var(--color-gold); opacity: 0.3; }
.card { background: var(--color-white); border-radius: var(--radius-md); padding: var(--spacing-lg); box-shadow: var(--shadow-sm); transition: transform var(--transition-base), box-shadow var(--transition-base); }
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.tag { display: inline-block; padding: 2px 12px; background: var(--color-gold); color: var(--color-primary-dark); border-radius: var(--radius-full); font-size: 12px; font-weight: 600; font-family: var(--font-mono); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .header__brand-name { font-size: 20px; }
  .header__nav-link { padding: 10px 16px; font-size: 14px; }
  .footer__nav { gap: var(--spacing-xs) var(--spacing-md); }
  .footer__info { flex-direction: column; align-items: center; gap: var(--spacing-sm); }
}

@media (max-width: 768px) {
  :root { --header-top-height: 56px; }
  .header__top { padding: 0 var(--spacing-md); }
  .header__brand-icon { width: 34px; height: 34px; font-size: 18px; }
  .header__brand-name { font-size: 18px; letter-spacing: 1px; }
  .header__brand-desc { font-size: 11px; letter-spacing: 2px; }
  .header__toggle { display: flex; }
  .header__nav { display: none; position: absolute; top: var(--header-top-height); left: 0; right: 0; z-index: 1000; background: var(--color-primary-dark); box-shadow: var(--shadow-md); }
  .header__nav[data-open] { display: block; }
  .header__nav-list { flex-direction: column; padding: var(--spacing-sm) 0; gap: 0; }
  .header__nav-link { padding: 14px var(--spacing-lg); width: 100%; text-align: left; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .header__nav-link[aria-current="page"]::after { display: none; }
  .header__nav-link[aria-current="page"] { background: rgba(255,255,255,0.08); }
  .btn--gold { padding: 8px 18px; font-size: 14px; }
  h1 { font-size: 28px; }
  h2 { font-size: 24px; }
  h3 { font-size: 20px; }
  .content-section { padding: var(--spacing-2xl) 0; }
  .container { padding: 0 var(--spacing-md); }
  .footer { padding: var(--spacing-2xl) 0 var(--spacing-lg); }
  .footer__slogan { font-size: 22px; letter-spacing: 4px; }
  .footer__slogan::before, .footer__slogan::after { margin: 0 var(--spacing-sm); }
  .footer__nav { gap: var(--spacing-xs) var(--spacing-md); }
  .footer__nav-link { font-size: 13px; }
  .img-container--hero { height: 40vh; min-height: 240px; }
}

@media (max-width: 480px) {
  .header__brand-name { font-size: 16px; }
  .header__brand-desc { display: none; }
  .header__actions .btn--gold { padding: 6px 14px; font-size: 13px; }
  .header__brand-icon { width: 30px; height: 30px; font-size: 16px; }
  .footer__slogan { font-size: 18px; letter-spacing: 2px; }
  .footer__nav-link { font-size: 12px; }
  .footer__info-item { font-size: 12px; }
}

/* ===== PREFERS REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0s !important; animation-duration: 0s !important; }
  html { scroll-behavior: auto; }
  .card:hover { transform: none; }
  .btn:hover { transform: none; }
}

/* ===== PRINT ===== */
@media print {
  .header, .footer, .skip-link, [data-nav-toggle], [data-scroll-top] { display: none !important; }
  body { background: white; color: black; font-size: 12pt; }
  a[href]::after { content: " (" attr(href) ")"; font-size: 10pt; }
}